US 12,187,378 B2
Pedal crank drive comprising a pedal crank and a chain ring, and production method
Joao Filipe Tavares Miranda, Agueda (PT)
Assigned to MIRANDA & IRMAO, LDA., Agueda (PT)
Appl. No. 17/759,759
Filed by MIRANDA & IRMAO, LDA., Agueda (PT)
PCT Filed Jan. 29, 2021, PCT No. PCT/EP2021/052219
§ 371(c)(1), (2) Date Jul. 29, 2022,
PCT Pub. No. WO2021/152155, PCT Pub. Date Aug. 5, 2021.
Claims priority of application No. 102020102460.6 (DE), filed on Jan. 31, 2020.
Prior Publication US 2023/0127274 A1, Apr. 27, 2023
Int. Cl. B62M 1/36 (2013.01); B62M 9/00 (2006.01)
CPC B62M 1/36 (2013.01) [B62M 9/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A pedal crank drive comprising a pedal crank (12) and a chain ring (14) connected to one another in a rotationally fixed manner to form a unit (10), the unit (10) having a spindle hole (16) for a bottom bracket spindle,
wherein the chain ring (14) has a first connecting contour (18) and the pedal crank (12) has a second connecting contour (20), wherein the first and second connecting contours (18, 20) are fitted into one another in an assembly position, and the pedal crank (12) and the chain ring (14) are rotated relative to one another around the spindle hole (16) into a stop position in which stop surfaces (22, 24) of the pedal crank (12) and the chain ring (14) abut against each other, and
wherein the first connecting contour (18) has at least one inwardly projecting protrusion (26) on a central recess of the chain ring (14) having a circular shape.